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Finding the Fourth Proportional to 1,392.73, 2,088.99 and 570.78

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Solution

The fourth proportional to 1,392.73, 2,088.99 and 570.78 is: 856.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.73 : 2,088.99 = 570.78 : x
  2. Step 2: Convert to fraction form
    1,392.73/2,088.99 = 570.78/x
  3. Step 3: Cross multiply
    1,392.73x = 2,088.99 × 570.78
  4. Step 4: Simplify right side
    1,392.73x = 1,192,353.71
  5. Step 5: Solve for x
    x = 1,192,353.71/1,392.73
  6. Step 6: Final answer
    x = 856.13

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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.