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Finding the Fourth Proportional to 211,411.40, 317,117.10 and 128,467.40

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Solution

The fourth proportional to 211,411.40, 317,117.10 and 128,467.40 is: 192,701.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    211,411.40 : 317,117.10 = 128,467.40 : x
  2. Step 2: Convert to fraction form
    211,411.40/317,117.10 = 128,467.40/x
  3. Step 3: Cross multiply
    211,411.40x = 317,117.10 × 128,467.40
  4. Step 4: Simplify right side
    211,411.40x = 40,739,209,332.54
  5. Step 5: Solve for x
    x = 40,739,209,332.54/211,411.40
  6. Step 6: Final answer
    x = 192,701.10

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Similar ratio
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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.