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Finding the Fourth Proportional to 856.77, 1,290.17 and 614.98

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Solution

The fourth proportional to 856.77, 1,290.17 and 614.98 is: 926.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    856.77 : 1,290.17 = 614.98 : x
  2. Step 2: Convert to fraction form
    856.77/1,290.17 = 614.98/x
  3. Step 3: Cross multiply
    856.77x = 1,290.17 × 614.98
  4. Step 4: Simplify right side
    856.77x = 793,428.75
  5. Step 5: Solve for x
    x = 793,428.75/856.77
  6. Step 6: Final answer
    x = 926.07

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.