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Finding the Fourth Proportional to 712,615.78, 983,410.20 and 390,331.26

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Solution

The fourth proportional to 712,615.78, 983,410.20 and 390,331.26 is: 538,657.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,615.78 : 983,410.20 = 390,331.26 : x
  2. Step 2: Convert to fraction form
    712,615.78/983,410.20 = 390,331.26/x
  3. Step 3: Cross multiply
    712,615.78x = 983,410.20 × 390,331.26
  4. Step 4: Simplify right side
    712,615.78x = 383,855,742,462.85
  5. Step 5: Solve for x
    x = 383,855,742,462.85/712,615.78
  6. Step 6: Final answer
    x = 538,657.37

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.