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Finding the Fourth Proportional to 85,673.40, 128,510.10 and 76,925.40

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Solution

The fourth proportional to 85,673.40, 128,510.10 and 76,925.40 is: 115,388.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,673.40 : 128,510.10 = 76,925.40 : x
  2. Step 2: Convert to fraction form
    85,673.40/128,510.10 = 76,925.40/x
  3. Step 3: Cross multiply
    85,673.40x = 128,510.10 × 76,925.40
  4. Step 4: Simplify right side
    85,673.40x = 9,885,690,846.54
  5. Step 5: Solve for x
    x = 9,885,690,846.54/85,673.40
  6. Step 6: Final answer
    x = 115,388.10

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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.