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Finding the Fourth Proportional to 603,721.80, 905,582.70 and 391,145.40

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Solution

The fourth proportional to 603,721.80, 905,582.70 and 391,145.40 is: 586,718.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    603,721.80 : 905,582.70 = 391,145.40 : x
  2. Step 2: Convert to fraction form
    603,721.80/905,582.70 = 391,145.40/x
  3. Step 3: Cross multiply
    603,721.80x = 905,582.70 × 391,145.40
  4. Step 4: Simplify right side
    603,721.80x = 354,214,507,424.58
  5. Step 5: Solve for x
    x = 354,214,507,424.58/603,721.80
  6. Step 6: Final answer
    x = 586,718.10

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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.