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Finding the Fourth Proportional to 85,904.40, 128,856.60 and 59,660.40

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Solution

The fourth proportional to 85,904.40, 128,856.60 and 59,660.40 is: 89,490.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,904.40 : 128,856.60 = 59,660.40 : x
  2. Step 2: Convert to fraction form
    85,904.40/128,856.60 = 59,660.40/x
  3. Step 3: Cross multiply
    85,904.40x = 128,856.60 × 59,660.40
  4. Step 4: Simplify right side
    85,904.40x = 7,687,636,298.64
  5. Step 5: Solve for x
    x = 7,687,636,298.64/85,904.40
  6. Step 6: Final answer
    x = 89,490.60

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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.