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Finding the Fourth Proportional to 18,897.60, 28,346.40 and 6,420.90

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Solution

The fourth proportional to 18,897.60, 28,346.40 and 6,420.90 is: 9,631.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,897.60 : 28,346.40 = 6,420.90 : x
  2. Step 2: Convert to fraction form
    18,897.60/28,346.40 = 6,420.90/x
  3. Step 3: Cross multiply
    18,897.60x = 28,346.40 × 6,420.90
  4. Step 4: Simplify right side
    18,897.60x = 182,009,399.76
  5. Step 5: Solve for x
    x = 182,009,399.76/18,897.60
  6. Step 6: Final answer
    x = 9,631.35

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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.