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Finding the Fourth Proportional to 612,111.10, 918,166.65 and 486,139.90

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Solution

The fourth proportional to 612,111.10, 918,166.65 and 486,139.90 is: 729,209.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,111.10 : 918,166.65 = 486,139.90 : x
  2. Step 2: Convert to fraction form
    612,111.10/918,166.65 = 486,139.90/x
  3. Step 3: Cross multiply
    612,111.10x = 918,166.65 × 486,139.90
  4. Step 4: Simplify right side
    612,111.10x = 446,357,443,414.34
  5. Step 5: Solve for x
    x = 446,357,443,414.34/612,111.10
  6. Step 6: Final answer
    x = 729,209.85

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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.