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Finding the Fourth Proportional to 710,639.20, 980,676.12 and 388,346.50

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Solution

The fourth proportional to 710,639.20, 980,676.12 and 388,346.50 is: 535,914.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    710,639.20 : 980,676.12 = 388,346.50 : x
  2. Step 2: Convert to fraction form
    710,639.20/980,676.12 = 388,346.50/x
  3. Step 3: Cross multiply
    710,639.20x = 980,676.12 × 388,346.50
  4. Step 4: Simplify right side
    710,639.20x = 380,842,138,835.58
  5. Step 5: Solve for x
    x = 380,842,138,835.58/710,639.20
  6. Step 6: Final answer
    x = 535,914.90

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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.