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Finding the Fourth Proportional to 91,720.30, 128,641.70 and 91,720.30

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Solution

The fourth proportional to 91,720.30, 128,641.70 and 91,720.30 is: 128,641.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,720.30 : 128,641.70 = 91,720.30 : x
  2. Step 2: Convert to fraction form
    91,720.30/128,641.70 = 91,720.30/x
  3. Step 3: Cross multiply
    91,720.30x = 128,641.70 × 91,720.30
  4. Step 4: Simplify right side
    91,720.30x = 11,799,055,316.51
  5. Step 5: Solve for x
    x = 11,799,055,316.51/91,720.30
  6. Step 6: Final answer
    x = 128,641.70

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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.