Home / 712,686.14-983,507.08-390,407.78

Finding the Fourth Proportional to 712,686.14, 983,507.08 and 390,407.78

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Solution

The fourth proportional to 712,686.14, 983,507.08 and 390,407.78 is: 538,762.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,686.14 : 983,507.08 = 390,407.78 : x
  2. Step 2: Convert to fraction form
    712,686.14/983,507.08 = 390,407.78/x
  3. Step 3: Cross multiply
    712,686.14x = 983,507.08 × 390,407.78
  4. Step 4: Simplify right side
    712,686.14x = 383,968,815,717.08
  5. Step 5: Solve for x
    x = 383,968,815,717.08/712,686.14
  6. Step 6: Final answer
    x = 538,762.85

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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.