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Finding the Fourth Proportional to 1,008.66, 1,390.77 and 946.39

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Solution

The fourth proportional to 1,008.66, 1,390.77 and 946.39 is: 1,304.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.66 : 1,390.77 = 946.39 : x
  2. Step 2: Convert to fraction form
    1,008.66/1,390.77 = 946.39/x
  3. Step 3: Cross multiply
    1,008.66x = 1,390.77 × 946.39
  4. Step 4: Simplify right side
    1,008.66x = 1,316,210.82
  5. Step 5: Solve for x
    x = 1,316,210.82/1,008.66
  6. Step 6: Final answer
    x = 1,304.91

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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.