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Finding the Fourth Proportional to 1,315.76, 1,972.93 and 656.20

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Solution

The fourth proportional to 1,315.76, 1,972.93 and 656.20 is: 983.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.76 : 1,972.93 = 656.20 : x
  2. Step 2: Convert to fraction form
    1,315.76/1,972.93 = 656.20/x
  3. Step 3: Cross multiply
    1,315.76x = 1,972.93 × 656.20
  4. Step 4: Simplify right side
    1,315.76x = 1,294,636.67
  5. Step 5: Solve for x
    x = 1,294,636.67/1,315.76
  6. Step 6: Final answer
    x = 983.95

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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.