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Finding the Fourth Proportional to 661,507.49, 991,012.61 and 390,827.97

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Solution

The fourth proportional to 661,507.49, 991,012.61 and 390,827.97 is: 585,504.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,507.49 : 991,012.61 = 390,827.97 : x
  2. Step 2: Convert to fraction form
    661,507.49/991,012.61 = 390,827.97/x
  3. Step 3: Cross multiply
    661,507.49x = 991,012.61 × 390,827.97
  4. Step 4: Simplify right side
    661,507.49x = 387,315,447,587.77
  5. Step 5: Solve for x
    x = 387,315,447,587.77/661,507.49
  6. Step 6: Final answer
    x = 585,504.25

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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.