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Finding the Fourth Proportional to 287,085.40, 430,628.10 and 87,404.20

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Solution

The fourth proportional to 287,085.40, 430,628.10 and 87,404.20 is: 131,106.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,085.40 : 430,628.10 = 87,404.20 : x
  2. Step 2: Convert to fraction form
    287,085.40/430,628.10 = 87,404.20/x
  3. Step 3: Cross multiply
    287,085.40x = 430,628.10 × 87,404.20
  4. Step 4: Simplify right side
    287,085.40x = 37,638,704,578.02
  5. Step 5: Solve for x
    x = 37,638,704,578.02/287,085.40
  6. Step 6: Final answer
    x = 131,106.30

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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.