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Finding the Fourth Proportional to 947.68, 1,308.40 and 715.84

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Solution

The fourth proportional to 947.68, 1,308.40 and 715.84 is: 988.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.68 : 1,308.40 = 715.84 : x
  2. Step 2: Convert to fraction form
    947.68/1,308.40 = 715.84/x
  3. Step 3: Cross multiply
    947.68x = 1,308.40 × 715.84
  4. Step 4: Simplify right side
    947.68x = 936,605.06
  5. Step 5: Solve for x
    x = 936,605.06/947.68
  6. Step 6: Final answer
    x = 988.31

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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.