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Finding the Fourth Proportional to 85,910.40, 128,865.60 and 59,666.40

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Solution

The fourth proportional to 85,910.40, 128,865.60 and 59,666.40 is: 89,499.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,910.40 : 128,865.60 = 59,666.40 : x
  2. Step 2: Convert to fraction form
    85,910.40/128,865.60 = 59,666.40/x
  3. Step 3: Cross multiply
    85,910.40x = 128,865.60 × 59,666.40
  4. Step 4: Simplify right side
    85,910.40x = 7,688,946,435.84
  5. Step 5: Solve for x
    x = 7,688,946,435.84/85,910.40
  6. Step 6: Final answer
    x = 89,499.60

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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.