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Finding the Fourth Proportional to 1,307.65, 1,959 and 648.76

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Solution

The fourth proportional to 1,307.65, 1,959 and 648.76 is: 971.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,307.65 : 1,959 = 648.76 : x
  2. Step 2: Convert to fraction form
    1,307.65/1,959 = 648.76/x
  3. Step 3: Cross multiply
    1,307.65x = 1,959 × 648.76
  4. Step 4: Simplify right side
    1,307.65x = 1,270,920.84
  5. Step 5: Solve for x
    x = 1,270,920.84/1,307.65
  6. Step 6: Final answer
    x = 971.91

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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.