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Finding the Fourth Proportional to 85,678.60, 128,479.02 and 30,274.60

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Solution

The fourth proportional to 85,678.60, 128,479.02 and 30,274.60 is: 45,398.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,678.60 : 128,479.02 = 30,274.60 : x
  2. Step 2: Convert to fraction form
    85,678.60/128,479.02 = 30,274.60/x
  3. Step 3: Cross multiply
    85,678.60x = 128,479.02 × 30,274.60
  4. Step 4: Simplify right side
    85,678.60x = 3,889,650,938.89
  5. Step 5: Solve for x
    x = 3,889,650,938.89/85,678.60
  6. Step 6: Final answer
    x = 45,398.16

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.