Home / 687,790.80-1,031,686.20-435,848.40

Finding the Fourth Proportional to 687,790.80, 1,031,686.20 and 435,848.40

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Solution

The fourth proportional to 687,790.80, 1,031,686.20 and 435,848.40 is: 653,772.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    687,790.80 : 1,031,686.20 = 435,848.40 : x
  2. Step 2: Convert to fraction form
    687,790.80/1,031,686.20 = 435,848.40/x
  3. Step 3: Cross multiply
    687,790.80x = 1,031,686.20 × 435,848.40
  4. Step 4: Simplify right side
    687,790.80x = 449,658,779,572.08
  5. Step 5: Solve for x
    x = 449,658,779,572.08/687,790.80
  6. Step 6: Final answer
    x = 653,772.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.