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Finding the Fourth Proportional to 612,939.40, 917,702.70 and 312,771.40

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Solution

The fourth proportional to 612,939.40, 917,702.70 and 312,771.40 is: 468,286.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,939.40 : 917,702.70 = 312,771.40 : x
  2. Step 2: Convert to fraction form
    612,939.40/917,702.70 = 312,771.40/x
  3. Step 3: Cross multiply
    612,939.40x = 917,702.70 × 312,771.40
  4. Step 4: Simplify right side
    612,939.40x = 287,031,158,262.78
  5. Step 5: Solve for x
    x = 287,031,158,262.78/612,939.40
  6. Step 6: Final answer
    x = 468,286.36

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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.