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Finding the Fourth Proportional to 612,221.70, 917,567.10 and 312,821.40

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Solution

The fourth proportional to 612,221.70, 917,567.10 and 312,821.40 is: 468,840.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,221.70 : 917,567.10 = 312,821.40 : x
  2. Step 2: Convert to fraction form
    612,221.70/917,567.10 = 312,821.40/x
  3. Step 3: Cross multiply
    612,221.70x = 917,567.10 × 312,821.40
  4. Step 4: Simplify right side
    612,221.70x = 287,034,624,815.94
  5. Step 5: Solve for x
    x = 287,034,624,815.94/612,221.70
  6. Step 6: Final answer
    x = 468,840.98

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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.