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Finding the Fourth Proportional to 659,999.60, 989,999.40 and 390,561.20

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Solution

The fourth proportional to 659,999.60, 989,999.40 and 390,561.20 is: 585,841.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,999.60 : 989,999.40 = 390,561.20 : x
  2. Step 2: Convert to fraction form
    659,999.60/989,999.40 = 390,561.20/x
  3. Step 3: Cross multiply
    659,999.60x = 989,999.40 × 390,561.20
  4. Step 4: Simplify right side
    659,999.60x = 386,655,353,663.28
  5. Step 5: Solve for x
    x = 386,655,353,663.28/659,999.60
  6. Step 6: Final answer
    x = 585,841.80

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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.