Home / 1,158.90-1,738.35-389.40

Finding the Fourth Proportional to 1,158.90, 1,738.35 and 389.40

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Solution

The fourth proportional to 1,158.90, 1,738.35 and 389.40 is: 584.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,158.90 : 1,738.35 = 389.40 : x
  2. Step 2: Convert to fraction form
    1,158.90/1,738.35 = 389.40/x
  3. Step 3: Cross multiply
    1,158.90x = 1,738.35 × 389.40
  4. Step 4: Simplify right side
    1,158.90x = 676,913.49
  5. Step 5: Solve for x
    x = 676,913.49/1,158.90
  6. Step 6: Final answer
    x = 584.10

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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.