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Finding the Fourth Proportional to 91,888.20, 128,774.70 and 91,888.20

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Solution

The fourth proportional to 91,888.20, 128,774.70 and 91,888.20 is: 128,774.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,888.20 : 128,774.70 = 91,888.20 : x
  2. Step 2: Convert to fraction form
    91,888.20/128,774.70 = 91,888.20/x
  3. Step 3: Cross multiply
    91,888.20x = 128,774.70 × 91,888.20
  4. Step 4: Simplify right side
    91,888.20x = 11,832,875,388.54
  5. Step 5: Solve for x
    x = 11,832,875,388.54/91,888.20
  6. Step 6: Final answer
    x = 128,774.70

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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.