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Finding the Fourth Proportional to 91,721.30, 128,643.10 and 91,721.30

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Solution

The fourth proportional to 91,721.30, 128,643.10 and 91,721.30 is: 128,643.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,721.30 : 128,643.10 = 91,721.30 : x
  2. Step 2: Convert to fraction form
    91,721.30/128,643.10 = 91,721.30/x
  3. Step 3: Cross multiply
    91,721.30x = 128,643.10 × 91,721.30
  4. Step 4: Simplify right side
    91,721.30x = 11,799,312,368.03
  5. Step 5: Solve for x
    x = 11,799,312,368.03/91,721.30
  6. Step 6: Final answer
    x = 128,643.10

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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.