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Finding the Fourth Proportional to 570,436.29, 787,211.40 and 312,308.91

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Solution

The fourth proportional to 570,436.29, 787,211.40 and 312,308.91 is: 430,991.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    570,436.29 : 787,211.40 = 312,308.91 : x
  2. Step 2: Convert to fraction form
    570,436.29/787,211.40 = 312,308.91/x
  3. Step 3: Cross multiply
    570,436.29x = 787,211.40 × 312,308.91
  4. Step 4: Simplify right side
    570,436.29x = 245,853,134,273.57
  5. Step 5: Solve for x
    x = 245,853,134,273.57/570,436.29
  6. Step 6: Final answer
    x = 430,991.40

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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.