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Finding the Fourth Proportional to 712,841.32, 983,721 and 390,563.62

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Solution

The fourth proportional to 712,841.32, 983,721 and 390,563.62 is: 538,977.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,841.32 : 983,721 = 390,563.62 : x
  2. Step 2: Convert to fraction form
    712,841.32/983,721 = 390,563.62/x
  3. Step 3: Cross multiply
    712,841.32x = 983,721 × 390,563.62
  4. Step 4: Simplify right side
    712,841.32x = 384,205,634,830.02
  5. Step 5: Solve for x
    x = 384,205,634,830.02/712,841.32
  6. Step 6: Final answer
    x = 538,977.78

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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.