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Finding the Fourth Proportional to 1,068.48, 1,602.72 and 780.48

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Solution

The fourth proportional to 1,068.48, 1,602.72 and 780.48 is: 1,170.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,068.48 : 1,602.72 = 780.48 : x
  2. Step 2: Convert to fraction form
    1,068.48/1,602.72 = 780.48/x
  3. Step 3: Cross multiply
    1,068.48x = 1,602.72 × 780.48
  4. Step 4: Simplify right side
    1,068.48x = 1,250,890.91
  5. Step 5: Solve for x
    x = 1,250,890.91/1,068.48
  6. Step 6: Final answer
    x = 1,170.72

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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.