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Finding the Fourth Proportional to 71,509.79, 98,683.50 and 39,678.92

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Solution

The fourth proportional to 71,509.79, 98,683.50 and 39,678.92 is: 54,756.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,509.79 : 98,683.50 = 39,678.92 : x
  2. Step 2: Convert to fraction form
    71,509.79/98,683.50 = 39,678.92/x
  3. Step 3: Cross multiply
    71,509.79x = 98,683.50 × 39,678.92
  4. Step 4: Simplify right side
    71,509.79x = 3,915,654,208.40
  5. Step 5: Solve for x
    x = 3,915,654,208.40/71,509.79
  6. Step 6: Final answer
    x = 54,756.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.