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Finding the Fourth Proportional to 151,353.70, 208,868.13 and 87,728.40

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Solution

The fourth proportional to 151,353.70, 208,868.13 and 87,728.40 is: 121,065.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    151,353.70 : 208,868.13 = 87,728.40 : x
  2. Step 2: Convert to fraction form
    151,353.70/208,868.13 = 87,728.40/x
  3. Step 3: Cross multiply
    151,353.70x = 208,868.13 × 87,728.40
  4. Step 4: Simplify right side
    151,353.70x = 18,323,666,855.89
  5. Step 5: Solve for x
    x = 18,323,666,855.89/151,353.70
  6. Step 6: Final answer
    x = 121,065.21

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.