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Finding the Fourth Proportional to 78,420.74, 108,219.29 and 42,611.31

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Solution

The fourth proportional to 78,420.74, 108,219.29 and 42,611.31 is: 58,802.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,420.74 : 108,219.29 = 42,611.31 : x
  2. Step 2: Convert to fraction form
    78,420.74/108,219.29 = 42,611.31/x
  3. Step 3: Cross multiply
    78,420.74x = 108,219.29 × 42,611.31
  4. Step 4: Simplify right side
    78,420.74x = 4,611,365,501.11
  5. Step 5: Solve for x
    x = 4,611,365,501.11/78,420.74
  6. Step 6: Final answer
    x = 58,802.89

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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.