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Finding the Fourth Proportional to 661,508.87, 991,014.67 and 390,829.35

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Solution

The fourth proportional to 661,508.87, 991,014.67 and 390,829.35 is: 585,506.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,508.87 : 991,014.67 = 390,829.35 : x
  2. Step 2: Convert to fraction form
    661,508.87/991,014.67 = 390,829.35/x
  3. Step 3: Cross multiply
    661,508.87x = 991,014.67 × 390,829.35
  4. Step 4: Simplify right side
    661,508.87x = 387,317,619,316.57
  5. Step 5: Solve for x
    x = 387,317,619,316.57/661,508.87
  6. Step 6: Final answer
    x = 585,506.31

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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.