Home / 1,431.20-2,146.80-457.40

Finding the Fourth Proportional to 1,431.20, 2,146.80 and 457.40

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Solution

The fourth proportional to 1,431.20, 2,146.80 and 457.40 is: 686.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,431.20 : 2,146.80 = 457.40 : x
  2. Step 2: Convert to fraction form
    1,431.20/2,146.80 = 457.40/x
  3. Step 3: Cross multiply
    1,431.20x = 2,146.80 × 457.40
  4. Step 4: Simplify right side
    1,431.20x = 981,946.32
  5. Step 5: Solve for x
    x = 981,946.32/1,431.20
  6. Step 6: Final answer
    x = 686.10

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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.