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Finding the Fourth Proportional to 108,907,985.70, 163,361,978.55 and 84,249,123.30

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Solution

The fourth proportional to 108,907,985.70, 163,361,978.55 and 84,249,123.30 is: 126,373,684.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,907,985.70 : 163,361,978.55 = 84,249,123.30 : x
  2. Step 2: Convert to fraction form
    108,907,985.70/163,361,978.55 = 84,249,123.30/x
  3. Step 3: Cross multiply
    108,907,985.70x = 163,361,978.55 × 84,249,123.30
  4. Step 4: Simplify right side
    108,907,985.70x = 13,763,103,473,390,906
  5. Step 5: Solve for x
    x = 13,763,103,473,390,906/108,907,985.70
  6. Step 6: Final answer
    x = 126,373,684.95

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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.