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Finding the Fourth Proportional to 56,858.96, 78,369 and 39,868.40

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Solution

The fourth proportional to 56,858.96, 78,369 and 39,868.40 is: 54,950.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,858.96 : 78,369 = 39,868.40 : x
  2. Step 2: Convert to fraction form
    56,858.96/78,369 = 39,868.40/x
  3. Step 3: Cross multiply
    56,858.96x = 78,369 × 39,868.40
  4. Step 4: Simplify right side
    56,858.96x = 3,124,446,639.60
  5. Step 5: Solve for x
    x = 3,124,446,639.60/56,858.96
  6. Step 6: Final answer
    x = 54,950.82

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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.