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Finding the Fourth Proportional to 987.86, 1,363.40 and 589.56

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Solution

The fourth proportional to 987.86, 1,363.40 and 589.56 is: 813.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.86 : 1,363.40 = 589.56 : x
  2. Step 2: Convert to fraction form
    987.86/1,363.40 = 589.56/x
  3. Step 3: Cross multiply
    987.86x = 1,363.40 × 589.56
  4. Step 4: Simplify right side
    987.86x = 803,803.16
  5. Step 5: Solve for x
    x = 803,803.16/987.86
  6. Step 6: Final answer
    x = 813.69

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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.