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Finding the Fourth Proportional to 85,878.20, 128,663.70 and 73,590.20

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Solution

The fourth proportional to 85,878.20, 128,663.70 and 73,590.20 is: 110,253.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,878.20 : 128,663.70 = 73,590.20 : x
  2. Step 2: Convert to fraction form
    85,878.20/128,663.70 = 73,590.20/x
  3. Step 3: Cross multiply
    85,878.20x = 128,663.70 × 73,590.20
  4. Step 4: Simplify right side
    85,878.20x = 9,468,387,415.74
  5. Step 5: Solve for x
    x = 9,468,387,415.74/85,878.20
  6. Step 6: Final answer
    x = 110,253.68

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.