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Finding the Fourth Proportional to 508,712.80, 763,069.20 and 390,978.40

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Solution

The fourth proportional to 508,712.80, 763,069.20 and 390,978.40 is: 586,467.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    508,712.80 : 763,069.20 = 390,978.40 : x
  2. Step 2: Convert to fraction form
    508,712.80/763,069.20 = 390,978.40/x
  3. Step 3: Cross multiply
    508,712.80x = 763,069.20 × 390,978.40
  4. Step 4: Simplify right side
    508,712.80x = 298,343,574,905.28
  5. Step 5: Solve for x
    x = 298,343,574,905.28/508,712.80
  6. Step 6: Final answer
    x = 586,467.60

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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.