Home / 1,420.28-2,129.58-554.42

Finding the Fourth Proportional to 1,420.28, 2,129.58 and 554.42

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Solution

The fourth proportional to 1,420.28, 2,129.58 and 554.42 is: 831.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.28 : 2,129.58 = 554.42 : x
  2. Step 2: Convert to fraction form
    1,420.28/2,129.58 = 554.42/x
  3. Step 3: Cross multiply
    1,420.28x = 2,129.58 × 554.42
  4. Step 4: Simplify right side
    1,420.28x = 1,180,681.74
  5. Step 5: Solve for x
    x = 1,180,681.74/1,420.28
  6. Step 6: Final answer
    x = 831.30

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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.