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Finding the Fourth Proportional to 118,712, 163,834.08 and 65,720

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Solution

The fourth proportional to 118,712, 163,834.08 and 65,720 is: 90,699.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,712 : 163,834.08 = 65,720 : x
  2. Step 2: Convert to fraction form
    118,712/163,834.08 = 65,720/x
  3. Step 3: Cross multiply
    118,712x = 163,834.08 × 65,720
  4. Step 4: Simplify right side
    118,712x = 10,767,175,737.60
  5. Step 5: Solve for x
    x = 10,767,175,737.60/118,712
  6. Step 6: Final answer
    x = 90,699.98

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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.