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Finding the Fourth Proportional to 661,509.49, 991,015.61 and 390,829.97

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Solution

The fourth proportional to 661,509.49, 991,015.61 and 390,829.97 is: 585,507.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,509.49 : 991,015.61 = 390,829.97 : x
  2. Step 2: Convert to fraction form
    661,509.49/991,015.61 = 390,829.97/x
  3. Step 3: Cross multiply
    661,509.49x = 991,015.61 × 390,829.97
  4. Step 4: Simplify right side
    661,509.49x = 387,318,601,125.83
  5. Step 5: Solve for x
    x = 387,318,601,125.83/661,509.49
  6. Step 6: Final answer
    x = 585,507.25

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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.