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Finding the Fourth Proportional to 72,420.88, 108,631.41 and 19,830.82

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Solution

The fourth proportional to 72,420.88, 108,631.41 and 19,830.82 is: 29,746.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,420.88 : 108,631.41 = 19,830.82 : x
  2. Step 2: Convert to fraction form
    72,420.88/108,631.41 = 19,830.82/x
  3. Step 3: Cross multiply
    72,420.88x = 108,631.41 × 19,830.82
  4. Step 4: Simplify right side
    72,420.88x = 2,154,249,938.06
  5. Step 5: Solve for x
    x = 2,154,249,938.06/72,420.88
  6. Step 6: Final answer
    x = 29,746.25

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1.5x scale

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.