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Finding the Fourth Proportional to 153,704.12, 212,111.28 and 85,721.18

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Solution

The fourth proportional to 153,704.12, 212,111.28 and 85,721.18 is: 118,295.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,704.12 : 212,111.28 = 85,721.18 : x
  2. Step 2: Convert to fraction form
    153,704.12/212,111.28 = 85,721.18/x
  3. Step 3: Cross multiply
    153,704.12x = 212,111.28 × 85,721.18
  4. Step 4: Simplify right side
    153,704.12x = 18,182,429,212.91
  5. Step 5: Solve for x
    x = 18,182,429,212.91/153,704.12
  6. Step 6: Final answer
    x = 118,295.00

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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.