Home / 712,624.29-983,421.95-390,339.78

Finding the Fourth Proportional to 712,624.29, 983,421.95 and 390,339.78

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Solution

The fourth proportional to 712,624.29, 983,421.95 and 390,339.78 is: 538,669.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,624.29 : 983,421.95 = 390,339.78 : x
  2. Step 2: Convert to fraction form
    712,624.29/983,421.95 = 390,339.78/x
  3. Step 3: Cross multiply
    712,624.29x = 983,421.95 × 390,339.78
  4. Step 4: Simplify right side
    712,624.29x = 383,868,705,658.47
  5. Step 5: Solve for x
    x = 383,868,705,658.47/712,624.29
  6. Step 6: Final answer
    x = 538,669.13

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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.