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Finding the Fourth Proportional to 1,307.80, 1,804.98 and 784.36

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Solution

The fourth proportional to 1,307.80, 1,804.98 and 784.36 is: 1,082.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,307.80 : 1,804.98 = 784.36 : x
  2. Step 2: Convert to fraction form
    1,307.80/1,804.98 = 784.36/x
  3. Step 3: Cross multiply
    1,307.80x = 1,804.98 × 784.36
  4. Step 4: Simplify right side
    1,307.80x = 1,415,754.11
  5. Step 5: Solve for x
    x = 1,415,754.11/1,307.80
  6. Step 6: Final answer
    x = 1,082.55

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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.