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Finding the Fourth Proportional to 780.76, 1,077.45 and 431.45

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Solution

The fourth proportional to 780.76, 1,077.45 and 431.45 is: 595.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.76 : 1,077.45 = 431.45 : x
  2. Step 2: Convert to fraction form
    780.76/1,077.45 = 431.45/x
  3. Step 3: Cross multiply
    780.76x = 1,077.45 × 431.45
  4. Step 4: Simplify right side
    780.76x = 464,858.26
  5. Step 5: Solve for x
    x = 464,858.26/780.76
  6. Step 6: Final answer
    x = 595.39

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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.