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Finding the Fourth Proportional to 947.36, 1,307.88 and 654.21

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Solution

The fourth proportional to 947.36, 1,307.88 and 654.21 is: 903.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.36 : 1,307.88 = 654.21 : x
  2. Step 2: Convert to fraction form
    947.36/1,307.88 = 654.21/x
  3. Step 3: Cross multiply
    947.36x = 1,307.88 × 654.21
  4. Step 4: Simplify right side
    947.36x = 855,628.17
  5. Step 5: Solve for x
    x = 855,628.17/947.36
  6. Step 6: Final answer
    x = 903.17

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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.