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Finding the Fourth Proportional to 612,071.70, 918,107.55 and 191,390.10

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Solution

The fourth proportional to 612,071.70, 918,107.55 and 191,390.10 is: 287,085.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,071.70 : 918,107.55 = 191,390.10 : x
  2. Step 2: Convert to fraction form
    612,071.70/918,107.55 = 191,390.10/x
  3. Step 3: Cross multiply
    612,071.70x = 918,107.55 × 191,390.10
  4. Step 4: Simplify right side
    612,071.70x = 175,716,695,805.26
  5. Step 5: Solve for x
    x = 175,716,695,805.26/612,071.70
  6. Step 6: Final answer
    x = 287,085.15

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.