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Finding the Fourth Proportional to 91,720.45, 128,132.15 and 91,720.45

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Solution

The fourth proportional to 91,720.45, 128,132.15 and 91,720.45 is: 128,132.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,720.45 : 128,132.15 = 91,720.45 : x
  2. Step 2: Convert to fraction form
    91,720.45/128,132.15 = 91,720.45/x
  3. Step 3: Cross multiply
    91,720.45x = 128,132.15 × 91,720.45
  4. Step 4: Simplify right side
    91,720.45x = 11,752,338,457.47
  5. Step 5: Solve for x
    x = 11,752,338,457.47/91,720.45
  6. Step 6: Final answer
    x = 128,132.15

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.