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Finding the Fourth Proportional to 287,303.75, 430,955.64 and 90,311.75

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Solution

The fourth proportional to 287,303.75, 430,955.64 and 90,311.75 is: 135,467.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,303.75 : 430,955.64 = 90,311.75 : x
  2. Step 2: Convert to fraction form
    287,303.75/430,955.64 = 90,311.75/x
  3. Step 3: Cross multiply
    287,303.75x = 430,955.64 × 90,311.75
  4. Step 4: Simplify right side
    287,303.75x = 38,920,358,020.77
  5. Step 5: Solve for x
    x = 38,920,358,020.77/287,303.75
  6. Step 6: Final answer
    x = 135,467.63

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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.