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Finding the Fourth Proportional to 1,315.17, 1,815.48 and 942.30

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Solution

The fourth proportional to 1,315.17, 1,815.48 and 942.30 is: 1,300.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.17 : 1,815.48 = 942.30 : x
  2. Step 2: Convert to fraction form
    1,315.17/1,815.48 = 942.30/x
  3. Step 3: Cross multiply
    1,315.17x = 1,815.48 × 942.30
  4. Step 4: Simplify right side
    1,315.17x = 1,710,726.80
  5. Step 5: Solve for x
    x = 1,710,726.80/1,315.17
  6. Step 6: Final answer
    x = 1,300.76

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.