Home / 1,729.18-2,387.18-1,389.40

Finding the Fourth Proportional to 1,729.18, 2,387.18 and 1,389.40

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Solution

The fourth proportional to 1,729.18, 2,387.18 and 1,389.40 is: 1,918.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,729.18 : 2,387.18 = 1,389.40 : x
  2. Step 2: Convert to fraction form
    1,729.18/2,387.18 = 1,389.40/x
  3. Step 3: Cross multiply
    1,729.18x = 2,387.18 × 1,389.40
  4. Step 4: Simplify right side
    1,729.18x = 3,316,747.89
  5. Step 5: Solve for x
    x = 3,316,747.89/1,729.18
  6. Step 6: Final answer
    x = 1,918.10

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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.