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Finding the Fourth Proportional to 947.51, 1,421.67 and 917.40

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Solution

The fourth proportional to 947.51, 1,421.67 and 917.40 is: 1,376.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.51 : 1,421.67 = 917.40 : x
  2. Step 2: Convert to fraction form
    947.51/1,421.67 = 917.40/x
  3. Step 3: Cross multiply
    947.51x = 1,421.67 × 917.40
  4. Step 4: Simplify right side
    947.51x = 1,304,240.06
  5. Step 5: Solve for x
    x = 1,304,240.06/947.51
  6. Step 6: Final answer
    x = 1,376.50

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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.