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Finding the Fourth Proportional to 390,056.84, 538,289.06 and 220,316.20

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Solution

The fourth proportional to 390,056.84, 538,289.06 and 220,316.20 is: 304,042.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,056.84 : 538,289.06 = 220,316.20 : x
  2. Step 2: Convert to fraction form
    390,056.84/538,289.06 = 220,316.20/x
  3. Step 3: Cross multiply
    390,056.84x = 538,289.06 × 220,316.20
  4. Step 4: Simplify right side
    390,056.84x = 118,593,800,200.77
  5. Step 5: Solve for x
    x = 118,593,800,200.77/390,056.84
  6. Step 6: Final answer
    x = 304,042.35

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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.