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Finding the Fourth Proportional to 1,111.64, 1,666.80 and 525.84

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Solution

The fourth proportional to 1,111.64, 1,666.80 and 525.84 is: 788.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,111.64 : 1,666.80 = 525.84 : x
  2. Step 2: Convert to fraction form
    1,111.64/1,666.80 = 525.84/x
  3. Step 3: Cross multiply
    1,111.64x = 1,666.80 × 525.84
  4. Step 4: Simplify right side
    1,111.64x = 876,470.11
  5. Step 5: Solve for x
    x = 876,470.11/1,111.64
  6. Step 6: Final answer
    x = 788.45

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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.