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Finding the Fourth Proportional to 153,878.48, 212,387.72 and 90,236.78

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Solution

The fourth proportional to 153,878.48, 212,387.72 and 90,236.78 is: 124,547.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,878.48 : 212,387.72 = 90,236.78 : x
  2. Step 2: Convert to fraction form
    153,878.48/212,387.72 = 90,236.78/x
  3. Step 3: Cross multiply
    153,878.48x = 212,387.72 × 90,236.78
  4. Step 4: Simplify right side
    153,878.48x = 19,165,182,451.22
  5. Step 5: Solve for x
    x = 19,165,182,451.22/153,878.48
  6. Step 6: Final answer
    x = 124,547.52

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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.