Home / 712,419.23-983,109.01-390,123.78

Finding the Fourth Proportional to 712,419.23, 983,109.01 and 390,123.78

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Solution

The fourth proportional to 712,419.23, 983,109.01 and 390,123.78 is: 538,354.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,419.23 : 983,109.01 = 390,123.78 : x
  2. Step 2: Convert to fraction form
    712,419.23/983,109.01 = 390,123.78/x
  3. Step 3: Cross multiply
    712,419.23x = 983,109.01 × 390,123.78
  4. Step 4: Simplify right side
    712,419.23x = 383,534,203,133.26
  5. Step 5: Solve for x
    x = 383,534,203,133.26/712,419.23
  6. Step 6: Final answer
    x = 538,354.65

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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.