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Finding the Fourth Proportional to 4,393.40, 6,590.40 and 1,391.20

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Solution

The fourth proportional to 4,393.40, 6,590.40 and 1,391.20 is: 2,086.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,393.40 : 6,590.40 = 1,391.20 : x
  2. Step 2: Convert to fraction form
    4,393.40/6,590.40 = 1,391.20/x
  3. Step 3: Cross multiply
    4,393.40x = 6,590.40 × 1,391.20
  4. Step 4: Simplify right side
    4,393.40x = 9,168,564.48
  5. Step 5: Solve for x
    x = 9,168,564.48/4,393.40
  6. Step 6: Final answer
    x = 2,086.89

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1.5x scale

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.