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Finding the Fourth Proportional to 1,368.95, 2,053.78 and 395.15

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Solution

The fourth proportional to 1,368.95, 2,053.78 and 395.15 is: 592.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,368.95 : 2,053.78 = 395.15 : x
  2. Step 2: Convert to fraction form
    1,368.95/2,053.78 = 395.15/x
  3. Step 3: Cross multiply
    1,368.95x = 2,053.78 × 395.15
  4. Step 4: Simplify right side
    1,368.95x = 811,539.91
  5. Step 5: Solve for x
    x = 811,539.91/1,368.95
  6. Step 6: Final answer
    x = 592.82

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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.