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Finding the Fourth Proportional to 740.78, 1,022.40 and 430.28

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Solution

The fourth proportional to 740.78, 1,022.40 and 430.28 is: 593.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.78 : 1,022.40 = 430.28 : x
  2. Step 2: Convert to fraction form
    740.78/1,022.40 = 430.28/x
  3. Step 3: Cross multiply
    740.78x = 1,022.40 × 430.28
  4. Step 4: Simplify right side
    740.78x = 439,918.27
  5. Step 5: Solve for x
    x = 439,918.27/740.78
  6. Step 6: Final answer
    x = 593.86

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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.