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Finding the Fourth Proportional to 455,430.30, 683,145.45 and 139,902.90

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Solution

The fourth proportional to 455,430.30, 683,145.45 and 139,902.90 is: 209,854.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    455,430.30 : 683,145.45 = 139,902.90 : x
  2. Step 2: Convert to fraction form
    455,430.30/683,145.45 = 139,902.90/x
  3. Step 3: Cross multiply
    455,430.30x = 683,145.45 × 139,902.90
  4. Step 4: Simplify right side
    455,430.30x = 95,574,029,576.81
  5. Step 5: Solve for x
    x = 95,574,029,576.81/455,430.30
  6. Step 6: Final answer
    x = 209,854.35

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Double scale
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Similar ratio
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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.