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Finding the Fourth Proportional to 310,079.12, 465,033.60 and 85,386.80

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Solution

The fourth proportional to 310,079.12, 465,033.60 and 85,386.80 is: 128,056.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    310,079.12 : 465,033.60 = 85,386.80 : x
  2. Step 2: Convert to fraction form
    310,079.12/465,033.60 = 85,386.80/x
  3. Step 3: Cross multiply
    310,079.12x = 465,033.60 × 85,386.80
  4. Step 4: Simplify right side
    310,079.12x = 39,707,730,996.48
  5. Step 5: Solve for x
    x = 39,707,730,996.48/310,079.12
  6. Step 6: Final answer
    x = 128,056.77

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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.