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Finding the Fourth Proportional to 740.32, 1,021.74 and 478.28

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Solution

The fourth proportional to 740.32, 1,021.74 and 478.28 is: 660.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.32 : 1,021.74 = 478.28 : x
  2. Step 2: Convert to fraction form
    740.32/1,021.74 = 478.28/x
  3. Step 3: Cross multiply
    740.32x = 1,021.74 × 478.28
  4. Step 4: Simplify right side
    740.32x = 488,675.42
  5. Step 5: Solve for x
    x = 488,675.42/740.32
  6. Step 6: Final answer
    x = 660.09

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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.