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Finding the Fourth Proportional to 78,779.67, 108,716.28 and 42,970.45

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Solution

The fourth proportional to 78,779.67, 108,716.28 and 42,970.45 is: 59,299.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,779.67 : 108,716.28 = 42,970.45 : x
  2. Step 2: Convert to fraction form
    78,779.67/108,716.28 = 42,970.45/x
  3. Step 3: Cross multiply
    78,779.67x = 108,716.28 × 42,970.45
  4. Step 4: Simplify right side
    78,779.67x = 4,671,587,516.76
  5. Step 5: Solve for x
    x = 4,671,587,516.76/78,779.67
  6. Step 6: Final answer
    x = 59,299.40

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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.