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Finding the Fourth Proportional to 108,690.10, 149,923.30 and 78,519.76

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Solution

The fourth proportional to 108,690.10, 149,923.30 and 78,519.76 is: 108,307.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,690.10 : 149,923.30 = 78,519.76 : x
  2. Step 2: Convert to fraction form
    108,690.10/149,923.30 = 78,519.76/x
  3. Step 3: Cross multiply
    108,690.10x = 149,923.30 × 78,519.76
  4. Step 4: Simplify right side
    108,690.10x = 11,771,941,534.41
  5. Step 5: Solve for x
    x = 11,771,941,534.41/108,690.10
  6. Step 6: Final answer
    x = 108,307.39

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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.