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Finding the Fourth Proportional to 287,323.74, 430,985.85 and 90,331.74

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Solution

The fourth proportional to 287,323.74, 430,985.85 and 90,331.74 is: 135,497.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,323.74 : 430,985.85 = 90,331.74 : x
  2. Step 2: Convert to fraction form
    287,323.74/430,985.85 = 90,331.74/x
  3. Step 3: Cross multiply
    287,323.74x = 430,985.85 × 90,331.74
  4. Step 4: Simplify right side
    287,323.74x = 38,931,701,745.88
  5. Step 5: Solve for x
    x = 38,931,701,745.88/287,323.74
  6. Step 6: Final answer
    x = 135,497.69

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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.