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Finding the Fourth Proportional to 772.69, 1,065.18 and 615.40

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Solution

The fourth proportional to 772.69, 1,065.18 and 615.40 is: 848.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    772.69 : 1,065.18 = 615.40 : x
  2. Step 2: Convert to fraction form
    772.69/1,065.18 = 615.40/x
  3. Step 3: Cross multiply
    772.69x = 1,065.18 × 615.40
  4. Step 4: Simplify right side
    772.69x = 655,511.77
  5. Step 5: Solve for x
    x = 655,511.77/772.69
  6. Step 6: Final answer
    x = 848.35

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.