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Finding the Fourth Proportional to 156,319.47, 215,720.21 and 84,699.78

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Solution

The fourth proportional to 156,319.47, 215,720.21 and 84,699.78 is: 116,885.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    156,319.47 : 215,720.21 = 84,699.78 : x
  2. Step 2: Convert to fraction form
    156,319.47/215,720.21 = 84,699.78/x
  3. Step 3: Cross multiply
    156,319.47x = 215,720.21 × 84,699.78
  4. Step 4: Simplify right side
    156,319.47x = 18,271,453,731.35
  5. Step 5: Solve for x
    x = 18,271,453,731.35/156,319.47
  6. Step 6: Final answer
    x = 116,885.34

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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.