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Finding the Fourth Proportional to 153,703.72, 212,110.72 and 85,720.78

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Solution

The fourth proportional to 153,703.72, 212,110.72 and 85,720.78 is: 118,294.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,703.72 : 212,110.72 = 85,720.78 : x
  2. Step 2: Convert to fraction form
    153,703.72/212,110.72 = 85,720.78/x
  3. Step 3: Cross multiply
    153,703.72x = 212,110.72 × 85,720.78
  4. Step 4: Simplify right side
    153,703.72x = 18,182,296,364.76
  5. Step 5: Solve for x
    x = 18,182,296,364.76/153,703.72
  6. Step 6: Final answer
    x = 118,294.45

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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.