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Finding the Fourth Proportional to 1,316.48, 1,816.71 and 718.95

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Solution

The fourth proportional to 1,316.48, 1,816.71 and 718.95 is: 992.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,316.48 : 1,816.71 = 718.95 : x
  2. Step 2: Convert to fraction form
    1,316.48/1,816.71 = 718.95/x
  3. Step 3: Cross multiply
    1,316.48x = 1,816.71 × 718.95
  4. Step 4: Simplify right side
    1,316.48x = 1,306,123.65
  5. Step 5: Solve for x
    x = 1,306,123.65/1,316.48
  6. Step 6: Final answer
    x = 992.13

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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.