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Finding the Fourth Proportional to 153,807.89, 212,254.19 and 85,820.90

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Solution

The fourth proportional to 153,807.89, 212,254.19 and 85,820.90 is: 118,432.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,807.89 : 212,254.19 = 85,820.90 : x
  2. Step 2: Convert to fraction form
    153,807.89/212,254.19 = 85,820.90/x
  3. Step 3: Cross multiply
    153,807.89x = 212,254.19 × 85,820.90
  4. Step 4: Simplify right side
    153,807.89x = 18,215,844,124.20
  5. Step 5: Solve for x
    x = 18,215,844,124.20/153,807.89
  6. Step 6: Final answer
    x = 118,432.45

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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.