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Finding the Fourth Proportional to 785.25, 1,177.91 and 438.32

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Solution

The fourth proportional to 785.25, 1,177.91 and 438.32 is: 657.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.25 : 1,177.91 = 438.32 : x
  2. Step 2: Convert to fraction form
    785.25/1,177.91 = 438.32/x
  3. Step 3: Cross multiply
    785.25x = 1,177.91 × 438.32
  4. Step 4: Simplify right side
    785.25x = 516,301.51
  5. Step 5: Solve for x
    x = 516,301.51/785.25
  6. Step 6: Final answer
    x = 657.50

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Half scale
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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.