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Finding the Fourth Proportional to 153,612.88, 211,865.59 and 99,915.04

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Solution

The fourth proportional to 153,612.88, 211,865.59 and 99,915.04 is: 137,804.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,612.88 : 211,865.59 = 99,915.04 : x
  2. Step 2: Convert to fraction form
    153,612.88/211,865.59 = 99,915.04/x
  3. Step 3: Cross multiply
    153,612.88x = 211,865.59 × 99,915.04
  4. Step 4: Simplify right side
    153,612.88x = 21,168,558,899.47
  5. Step 5: Solve for x
    x = 21,168,558,899.47/153,612.88
  6. Step 6: Final answer
    x = 137,804.58

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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.