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Finding the Fourth Proportional to 91,726.45, 128,140.55 and 91,726.45

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Solution

The fourth proportional to 91,726.45, 128,140.55 and 91,726.45 is: 128,140.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,726.45 : 128,140.55 = 91,726.45 : x
  2. Step 2: Convert to fraction form
    91,726.45/128,140.55 = 91,726.45/x
  3. Step 3: Cross multiply
    91,726.45x = 128,140.55 × 91,726.45
  4. Step 4: Simplify right side
    91,726.45x = 11,753,877,752.55
  5. Step 5: Solve for x
    x = 11,753,877,752.55/91,726.45
  6. Step 6: Final answer
    x = 128,140.55

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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.