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Finding the Fourth Proportional to 1,307.99, 1,960.58 and 648.95

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Solution

The fourth proportional to 1,307.99, 1,960.58 and 648.95 is: 972.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,307.99 : 1,960.58 = 648.95 : x
  2. Step 2: Convert to fraction form
    1,307.99/1,960.58 = 648.95/x
  3. Step 3: Cross multiply
    1,307.99x = 1,960.58 × 648.95
  4. Step 4: Simplify right side
    1,307.99x = 1,272,305.34
  5. Step 5: Solve for x
    x = 1,272,305.34/1,307.99
  6. Step 6: Final answer
    x = 972.72

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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.