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Finding the Fourth Proportional to 864.81, 1,188.51 and 810.13

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Solution

The fourth proportional to 864.81, 1,188.51 and 810.13 is: 1,113.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    864.81 : 1,188.51 = 810.13 : x
  2. Step 2: Convert to fraction form
    864.81/1,188.51 = 810.13/x
  3. Step 3: Cross multiply
    864.81x = 1,188.51 × 810.13
  4. Step 4: Simplify right side
    864.81x = 962,847.61
  5. Step 5: Solve for x
    x = 962,847.61/864.81
  6. Step 6: Final answer
    x = 1,113.36

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.