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Finding the Fourth Proportional to 739.09, 1,019.95 and 407.53

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Solution

The fourth proportional to 739.09, 1,019.95 and 407.53 is: 562.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.09 : 1,019.95 = 407.53 : x
  2. Step 2: Convert to fraction form
    739.09/1,019.95 = 407.53/x
  3. Step 3: Cross multiply
    739.09x = 1,019.95 × 407.53
  4. Step 4: Simplify right side
    739.09x = 415,658.18
  5. Step 5: Solve for x
    x = 415,658.18/739.09
  6. Step 6: Final answer
    x = 562.39

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Double scale
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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.