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Finding the Fourth Proportional to 1,235.85, 1,705.50 and 738.40

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Solution

The fourth proportional to 1,235.85, 1,705.50 and 738.40 is: 1,019.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,235.85 : 1,705.50 = 738.40 : x
  2. Step 2: Convert to fraction form
    1,235.85/1,705.50 = 738.40/x
  3. Step 3: Cross multiply
    1,235.85x = 1,705.50 × 738.40
  4. Step 4: Simplify right side
    1,235.85x = 1,259,341.20
  5. Step 5: Solve for x
    x = 1,259,341.20/1,235.85
  6. Step 6: Final answer
    x = 1,019.01

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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.