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Finding the Fourth Proportional to 147,615.40, 221,423.10 and 85,407.40

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Solution

The fourth proportional to 147,615.40, 221,423.10 and 85,407.40 is: 128,111.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    147,615.40 : 221,423.10 = 85,407.40 : x
  2. Step 2: Convert to fraction form
    147,615.40/221,423.10 = 85,407.40/x
  3. Step 3: Cross multiply
    147,615.40x = 221,423.10 × 85,407.40
  4. Step 4: Simplify right side
    147,615.40x = 18,911,171,270.94
  5. Step 5: Solve for x
    x = 18,911,171,270.94/147,615.40
  6. Step 6: Final answer
    x = 128,111.10

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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.