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Finding the Fourth Proportional to 153,988.70, 212,502.06 and 86,004.90

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Solution

The fourth proportional to 153,988.70, 212,502.06 and 86,004.90 is: 118,685.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,988.70 : 212,502.06 = 86,004.90 : x
  2. Step 2: Convert to fraction form
    153,988.70/212,502.06 = 86,004.90/x
  3. Step 3: Cross multiply
    153,988.70x = 212,502.06 × 86,004.90
  4. Step 4: Simplify right side
    153,988.70x = 18,276,218,420.09
  5. Step 5: Solve for x
    x = 18,276,218,420.09/153,988.70
  6. Step 6: Final answer
    x = 118,685.46

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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.