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Finding the Fourth Proportional to 355,428.19, 530,872.47 and 321,641.83

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Solution

The fourth proportional to 355,428.19, 530,872.47 and 321,641.83 is: 480,408.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    355,428.19 : 530,872.47 = 321,641.83 : x
  2. Step 2: Convert to fraction form
    355,428.19/530,872.47 = 321,641.83/x
  3. Step 3: Cross multiply
    355,428.19x = 530,872.47 × 321,641.83
  4. Step 4: Simplify right side
    355,428.19x = 170,750,788,484.85
  5. Step 5: Solve for x
    x = 170,750,788,484.85/355,428.19
  6. Step 6: Final answer
    x = 480,408.69

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.