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Finding the Fourth Proportional to 50,978.36, 70,347.75 and 28,318.79

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Solution

The fourth proportional to 50,978.36, 70,347.75 and 28,318.79 is: 39,078.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    50,978.36 : 70,347.75 = 28,318.79 : x
  2. Step 2: Convert to fraction form
    50,978.36/70,347.75 = 28,318.79/x
  3. Step 3: Cross multiply
    50,978.36x = 70,347.75 × 28,318.79
  4. Step 4: Simplify right side
    50,978.36x = 1,992,163,159.22
  5. Step 5: Solve for x
    x = 1,992,163,159.22/50,978.36
  6. Step 6: Final answer
    x = 39,078.60

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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.