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Finding the Fourth Proportional to 1,358, 1,875.12 and 1,064.78

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Solution

The fourth proportional to 1,358, 1,875.12 and 1,064.78 is: 1,470.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,358 : 1,875.12 = 1,064.78 : x
  2. Step 2: Convert to fraction form
    1,358/1,875.12 = 1,064.78/x
  3. Step 3: Cross multiply
    1,358x = 1,875.12 × 1,064.78
  4. Step 4: Simplify right side
    1,358x = 1,996,590.27
  5. Step 5: Solve for x
    x = 1,996,590.27/1,358
  6. Step 6: Final answer
    x = 1,470.24

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.