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Finding the Fourth Proportional to 991.66, 1,487.50 and 375.65

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Solution

The fourth proportional to 991.66, 1,487.50 and 375.65 is: 563.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.66 : 1,487.50 = 375.65 : x
  2. Step 2: Convert to fraction form
    991.66/1,487.50 = 375.65/x
  3. Step 3: Cross multiply
    991.66x = 1,487.50 × 375.65
  4. Step 4: Simplify right side
    991.66x = 558,782.87
  5. Step 5: Solve for x
    x = 558,782.87/991.66
  6. Step 6: Final answer
    x = 563.48

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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.