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Finding the Fourth Proportional to 740.15, 1,021.38 and 445.45

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Solution

The fourth proportional to 740.15, 1,021.38 and 445.45 is: 614.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    740.15 : 1,021.38 = 445.45 : x
  2. Step 2: Convert to fraction form
    740.15/1,021.38 = 445.45/x
  3. Step 3: Cross multiply
    740.15x = 1,021.38 × 445.45
  4. Step 4: Simplify right side
    740.15x = 454,973.72
  5. Step 5: Solve for x
    x = 454,973.72/740.15
  6. Step 6: Final answer
    x = 614.70

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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.