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Finding the Fourth Proportional to 353,079.60, 528,928.20 and 212,420.40

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Solution

The fourth proportional to 353,079.60, 528,928.20 and 212,420.40 is: 318,214.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    353,079.60 : 528,928.20 = 212,420.40 : x
  2. Step 2: Convert to fraction form
    353,079.60/528,928.20 = 212,420.40/x
  3. Step 3: Cross multiply
    353,079.60x = 528,928.20 × 212,420.40
  4. Step 4: Simplify right side
    353,079.60x = 112,355,139,815.28
  5. Step 5: Solve for x
    x = 112,355,139,815.28/353,079.60
  6. Step 6: Final answer
    x = 318,214.76

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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.