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Finding the Fourth Proportional to 518,290.08, 715,212.72 and 291,921

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Solution

The fourth proportional to 518,290.08, 715,212.72 and 291,921 is: 402,835.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    518,290.08 : 715,212.72 = 291,921 : x
  2. Step 2: Convert to fraction form
    518,290.08/715,212.72 = 291,921/x
  3. Step 3: Cross multiply
    518,290.08x = 715,212.72 × 291,921
  4. Step 4: Simplify right side
    518,290.08x = 208,785,612,435.12
  5. Step 5: Solve for x
    x = 208,785,612,435.12/518,290.08
  6. Step 6: Final answer
    x = 402,835.44

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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.