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Finding the Fourth Proportional to 56,505.84, 77,978.52 and 31,355.76

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Solution

The fourth proportional to 56,505.84, 77,978.52 and 31,355.76 is: 43,271.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,505.84 : 77,978.52 = 31,355.76 : x
  2. Step 2: Convert to fraction form
    56,505.84/77,978.52 = 31,355.76/x
  3. Step 3: Cross multiply
    56,505.84x = 77,978.52 × 31,355.76
  4. Step 4: Simplify right side
    56,505.84x = 2,445,075,758.28
  5. Step 5: Solve for x
    x = 2,445,075,758.28/56,505.84
  6. Step 6: Final answer
    x = 43,271.20

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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.