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Finding the Fourth Proportional to 153,911.52, 212,386.95 and 90,237

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Solution

The fourth proportional to 153,911.52, 212,386.95 and 90,237 is: 124,520.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,911.52 : 212,386.95 = 90,237 : x
  2. Step 2: Convert to fraction form
    153,911.52/212,386.95 = 90,237/x
  3. Step 3: Cross multiply
    153,911.52x = 212,386.95 × 90,237
  4. Step 4: Simplify right side
    153,911.52x = 19,165,161,207.15
  5. Step 5: Solve for x
    x = 19,165,161,207.15/153,911.52
  6. Step 6: Final answer
    x = 124,520.64

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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.