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Finding the Fourth Proportional to 390,312.68, 538,624.50 and 220,543.16

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Solution

The fourth proportional to 390,312.68, 538,624.50 and 220,543.16 is: 304,345.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,312.68 : 538,624.50 = 220,543.16 : x
  2. Step 2: Convert to fraction form
    390,312.68/538,624.50 = 220,543.16/x
  3. Step 3: Cross multiply
    390,312.68x = 538,624.50 × 220,543.16
  4. Step 4: Simplify right side
    390,312.68x = 118,789,949,283.42
  5. Step 5: Solve for x
    x = 118,789,949,283.42/390,312.68
  6. Step 6: Final answer
    x = 304,345.61

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.