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Finding the Fourth Proportional to 72,808,437.60, 109,212,656.40 and 18,955,749.60

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Solution

The fourth proportional to 72,808,437.60, 109,212,656.40 and 18,955,749.60 is: 28,433,624.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,808,437.60 : 109,212,656.40 = 18,955,749.60 : x
  2. Step 2: Convert to fraction form
    72,808,437.60/109,212,656.40 = 18,955,749.60/x
  3. Step 3: Cross multiply
    72,808,437.60x = 109,212,656.40 × 18,955,749.60
  4. Step 4: Simplify right side
    72,808,437.60x = 2,070,207,767,869,237.75
  5. Step 5: Solve for x
    x = 2,070,207,767,869,237.75/72,808,437.60
  6. Step 6: Final answer
    x = 28,433,624.40

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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.