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Finding the Fourth Proportional to 783.30, 1,080.64 and 503.48

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Solution

The fourth proportional to 783.30, 1,080.64 and 503.48 is: 694.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.30 : 1,080.64 = 503.48 : x
  2. Step 2: Convert to fraction form
    783.30/1,080.64 = 503.48/x
  3. Step 3: Cross multiply
    783.30x = 1,080.64 × 503.48
  4. Step 4: Simplify right side
    783.30x = 544,080.63
  5. Step 5: Solve for x
    x = 544,080.63/783.30
  6. Step 6: Final answer
    x = 694.60

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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.