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Finding the Fourth Proportional to 153,672, 212,068.98 and 86,604

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Solution

The fourth proportional to 153,672, 212,068.98 and 86,604 is: 119,514.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,672 : 212,068.98 = 86,604 : x
  2. Step 2: Convert to fraction form
    153,672/212,068.98 = 86,604/x
  3. Step 3: Cross multiply
    153,672x = 212,068.98 × 86,604
  4. Step 4: Simplify right side
    153,672x = 18,366,021,943.92
  5. Step 5: Solve for x
    x = 18,366,021,943.92/153,672
  6. Step 6: Final answer
    x = 119,514.43

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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.