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Finding the Fourth Proportional to 612,200.90, 918,301.35 and 425,576.90

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Solution

The fourth proportional to 612,200.90, 918,301.35 and 425,576.90 is: 638,365.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,200.90 : 918,301.35 = 425,576.90 : x
  2. Step 2: Convert to fraction form
    612,200.90/918,301.35 = 425,576.90/x
  3. Step 3: Cross multiply
    612,200.90x = 918,301.35 × 425,576.90
  4. Step 4: Simplify right side
    612,200.90x = 390,807,841,798.82
  5. Step 5: Solve for x
    x = 390,807,841,798.82/612,200.90
  6. Step 6: Final answer
    x = 638,365.35

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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.