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Finding the Fourth Proportional to 783.98, 1,080.86 and 651.32

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Solution

The fourth proportional to 783.98, 1,080.86 and 651.32 is: 897.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.98 : 1,080.86 = 651.32 : x
  2. Step 2: Convert to fraction form
    783.98/1,080.86 = 651.32/x
  3. Step 3: Cross multiply
    783.98x = 1,080.86 × 651.32
  4. Step 4: Simplify right side
    783.98x = 703,985.74
  5. Step 5: Solve for x
    x = 703,985.74/783.98
  6. Step 6: Final answer
    x = 897.96

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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.