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Finding the Fourth Proportional to 761.69, 1,050.87 and 621.56

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Solution

The fourth proportional to 761.69, 1,050.87 and 621.56 is: 857.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.69 : 1,050.87 = 621.56 : x
  2. Step 2: Convert to fraction form
    761.69/1,050.87 = 621.56/x
  3. Step 3: Cross multiply
    761.69x = 1,050.87 × 621.56
  4. Step 4: Simplify right side
    761.69x = 653,178.76
  5. Step 5: Solve for x
    x = 653,178.76/761.69
  6. Step 6: Final answer
    x = 857.54

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Double scale
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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.