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Finding the Fourth Proportional to 910.75, 1,257.15 and 561.45

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Solution

The fourth proportional to 910.75, 1,257.15 and 561.45 is: 775.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    910.75 : 1,257.15 = 561.45 : x
  2. Step 2: Convert to fraction form
    910.75/1,257.15 = 561.45/x
  3. Step 3: Cross multiply
    910.75x = 1,257.15 × 561.45
  4. Step 4: Simplify right side
    910.75x = 705,826.87
  5. Step 5: Solve for x
    x = 705,826.87/910.75
  6. Step 6: Final answer
    x = 775.00

Related Problems

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Half scale
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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.