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Finding the Fourth Proportional to 755.20, 1,130.05 and 623.98

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Solution

The fourth proportional to 755.20, 1,130.05 and 623.98 is: 933.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.20 : 1,130.05 = 623.98 : x
  2. Step 2: Convert to fraction form
    755.20/1,130.05 = 623.98/x
  3. Step 3: Cross multiply
    755.20x = 1,130.05 × 623.98
  4. Step 4: Simplify right side
    755.20x = 705,128.60
  5. Step 5: Solve for x
    x = 705,128.60/755.20
  6. Step 6: Final answer
    x = 933.70

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.