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Finding the Fourth Proportional to 1,174.02, 1,619.40 and 781.08

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Solution

The fourth proportional to 1,174.02, 1,619.40 and 781.08 is: 1,077.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,174.02 : 1,619.40 = 781.08 : x
  2. Step 2: Convert to fraction form
    1,174.02/1,619.40 = 781.08/x
  3. Step 3: Cross multiply
    1,174.02x = 1,619.40 × 781.08
  4. Step 4: Simplify right side
    1,174.02x = 1,264,880.95
  5. Step 5: Solve for x
    x = 1,264,880.95/1,174.02
  6. Step 6: Final answer
    x = 1,077.39

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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.