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Finding the Fourth Proportional to 1,056.80, 1,455.36 and 761.60

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Solution

The fourth proportional to 1,056.80, 1,455.36 and 761.60 is: 1,048.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,056.80 : 1,455.36 = 761.60 : x
  2. Step 2: Convert to fraction form
    1,056.80/1,455.36 = 761.60/x
  3. Step 3: Cross multiply
    1,056.80x = 1,455.36 × 761.60
  4. Step 4: Simplify right side
    1,056.80x = 1,108,402.18
  5. Step 5: Solve for x
    x = 1,108,402.18/1,056.80
  6. Step 6: Final answer
    x = 1,048.83

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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.