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Finding the Fourth Proportional to 783.04, 1,172.95 and 391.87

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Solution

The fourth proportional to 783.04, 1,172.95 and 391.87 is: 587.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.04 : 1,172.95 = 391.87 : x
  2. Step 2: Convert to fraction form
    783.04/1,172.95 = 391.87/x
  3. Step 3: Cross multiply
    783.04x = 1,172.95 × 391.87
  4. Step 4: Simplify right side
    783.04x = 459,643.92
  5. Step 5: Solve for x
    x = 459,643.92/783.04
  6. Step 6: Final answer
    x = 587.00

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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.