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Finding the Fourth Proportional to 926.99, 1,390.71 and 653.61

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Solution

The fourth proportional to 926.99, 1,390.71 and 653.61 is: 980.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.99 : 1,390.71 = 653.61 : x
  2. Step 2: Convert to fraction form
    926.99/1,390.71 = 653.61/x
  3. Step 3: Cross multiply
    926.99x = 1,390.71 × 653.61
  4. Step 4: Simplify right side
    926.99x = 908,981.96
  5. Step 5: Solve for x
    x = 908,981.96/926.99
  6. Step 6: Final answer
    x = 980.58

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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.