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Finding the Fourth Proportional to 712,340, 982,985.80 and 390,053.96

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Solution

The fourth proportional to 712,340, 982,985.80 and 390,053.96 is: 538,250.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,340 : 982,985.80 = 390,053.96 : x
  2. Step 2: Convert to fraction form
    712,340/982,985.80 = 390,053.96/x
  3. Step 3: Cross multiply
    712,340x = 982,985.80 × 390,053.96
  4. Step 4: Simplify right side
    712,340x = 383,417,503,913.77
  5. Step 5: Solve for x
    x = 383,417,503,913.77/712,340
  6. Step 6: Final answer
    x = 538,250.70

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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.