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Finding the Fourth Proportional to 8,590.40, 12,898.80 and 4,702.40

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Solution

The fourth proportional to 8,590.40, 12,898.80 and 4,702.40 is: 7,060.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,590.40 : 12,898.80 = 4,702.40 : x
  2. Step 2: Convert to fraction form
    8,590.40/12,898.80 = 4,702.40/x
  3. Step 3: Cross multiply
    8,590.40x = 12,898.80 × 4,702.40
  4. Step 4: Simplify right side
    8,590.40x = 60,655,317.12
  5. Step 5: Solve for x
    x = 60,655,317.12/8,590.40
  6. Step 6: Final answer
    x = 7,060.83

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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.