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Finding the Fourth Proportional to 155,712.58, 214,838.90 and 87,705.78

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Solution

The fourth proportional to 155,712.58, 214,838.90 and 87,705.78 is: 121,008.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    155,712.58 : 214,838.90 = 87,705.78 : x
  2. Step 2: Convert to fraction form
    155,712.58/214,838.90 = 87,705.78/x
  3. Step 3: Cross multiply
    155,712.58x = 214,838.90 × 87,705.78
  4. Step 4: Simplify right side
    155,712.58x = 18,842,613,298.84
  5. Step 5: Solve for x
    x = 18,842,613,298.84/155,712.58
  6. Step 6: Final answer
    x = 121,008.93

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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.