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Finding the Fourth Proportional to 761.51, 1,140.47 and 486.77

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Solution

The fourth proportional to 761.51, 1,140.47 and 486.77 is: 729.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.51 : 1,140.47 = 486.77 : x
  2. Step 2: Convert to fraction form
    761.51/1,140.47 = 486.77/x
  3. Step 3: Cross multiply
    761.51x = 1,140.47 × 486.77
  4. Step 4: Simplify right side
    761.51x = 555,138.45
  5. Step 5: Solve for x
    x = 555,138.45/761.51
  6. Step 6: Final answer
    x = 729.00

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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.