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Finding the Fourth Proportional to 1,390.32, 1,918.40 and 892.80

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Solution

The fourth proportional to 1,390.32, 1,918.40 and 892.80 is: 1,231.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.32 : 1,918.40 = 892.80 : x
  2. Step 2: Convert to fraction form
    1,390.32/1,918.40 = 892.80/x
  3. Step 3: Cross multiply
    1,390.32x = 1,918.40 × 892.80
  4. Step 4: Simplify right side
    1,390.32x = 1,712,743.06
  5. Step 5: Solve for x
    x = 1,712,743.06/1,390.32
  6. Step 6: Final answer
    x = 1,231.91

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1.5x scale

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.