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Finding the Fourth Proportional to 1,368.76, 2,053.20 and 666.61

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Solution

The fourth proportional to 1,368.76, 2,053.20 and 666.61 is: 999.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,368.76 : 2,053.20 = 666.61 : x
  2. Step 2: Convert to fraction form
    1,368.76/2,053.20 = 666.61/x
  3. Step 3: Cross multiply
    1,368.76x = 2,053.20 × 666.61
  4. Step 4: Simplify right side
    1,368.76x = 1,368,678.52
  5. Step 5: Solve for x
    x = 1,368,678.52/1,368.76
  6. Step 6: Final answer
    x = 999.94

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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.