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Finding the Fourth Proportional to 1,315.24, 1,970.21 and 655.13

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Solution

The fourth proportional to 1,315.24, 1,970.21 and 655.13 is: 981.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.24 : 1,970.21 = 655.13 : x
  2. Step 2: Convert to fraction form
    1,315.24/1,970.21 = 655.13/x
  3. Step 3: Cross multiply
    1,315.24x = 1,970.21 × 655.13
  4. Step 4: Simplify right side
    1,315.24x = 1,290,735.46
  5. Step 5: Solve for x
    x = 1,290,735.46/1,315.24
  6. Step 6: Final answer
    x = 981.37

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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.