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Finding the Fourth Proportional to 153,703.12, 212,109.92 and 85,720.16

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Solution

The fourth proportional to 153,703.12, 212,109.92 and 85,720.16 is: 118,293.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,703.12 : 212,109.92 = 85,720.16 : x
  2. Step 2: Convert to fraction form
    153,703.12/212,109.92 = 85,720.16/x
  3. Step 3: Cross multiply
    153,703.12x = 212,109.92 × 85,720.16
  4. Step 4: Simplify right side
    153,703.12x = 18,182,096,279.99
  5. Step 5: Solve for x
    x = 18,182,096,279.99/153,703.12
  6. Step 6: Final answer
    x = 118,293.61

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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.