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Finding the Fourth Proportional to 85,612.40, 128,564.40 and 56,160.80

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Solution

The fourth proportional to 85,612.40, 128,564.40 and 56,160.80 is: 84,336.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,612.40 : 128,564.40 = 56,160.80 : x
  2. Step 2: Convert to fraction form
    85,612.40/128,564.40 = 56,160.80/x
  3. Step 3: Cross multiply
    85,612.40x = 128,564.40 × 56,160.80
  4. Step 4: Simplify right side
    85,612.40x = 7,220,279,555.52
  5. Step 5: Solve for x
    x = 7,220,279,555.52/85,612.40
  6. Step 6: Final answer
    x = 84,336.84

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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.