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Finding the Fourth Proportional to 778.77, 1,075.55 and 484.74

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Solution

The fourth proportional to 778.77, 1,075.55 and 484.74 is: 669.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.77 : 1,075.55 = 484.74 : x
  2. Step 2: Convert to fraction form
    778.77/1,075.55 = 484.74/x
  3. Step 3: Cross multiply
    778.77x = 1,075.55 × 484.74
  4. Step 4: Simplify right side
    778.77x = 521,359.68
  5. Step 5: Solve for x
    x = 521,359.68/778.77
  6. Step 6: Final answer
    x = 669.47

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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.