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Finding the Fourth Proportional to 153,988.50, 212,483.10 and 85,996.80

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Solution

The fourth proportional to 153,988.50, 212,483.10 and 85,996.80 is: 118,663.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,988.50 : 212,483.10 = 85,996.80 : x
  2. Step 2: Convert to fraction form
    153,988.50/212,483.10 = 85,996.80/x
  3. Step 3: Cross multiply
    153,988.50x = 212,483.10 × 85,996.80
  4. Step 4: Simplify right side
    153,988.50x = 18,272,866,654.08
  5. Step 5: Solve for x
    x = 18,272,866,654.08/153,988.50
  6. Step 6: Final answer
    x = 118,663.84

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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.