Home / 1,287,643.40-1,931,465.10-389,223.80

Finding the Fourth Proportional to 1,287,643.40, 1,931,465.10 and 389,223.80

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Solution

The fourth proportional to 1,287,643.40, 1,931,465.10 and 389,223.80 is: 583,835.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287,643.40 : 1,931,465.10 = 389,223.80 : x
  2. Step 2: Convert to fraction form
    1,287,643.40/1,931,465.10 = 389,223.80/x
  3. Step 3: Cross multiply
    1,287,643.40x = 1,931,465.10 × 389,223.80
  4. Step 4: Simplify right side
    1,287,643.40x = 751,772,185,789.38
  5. Step 5: Solve for x
    x = 751,772,185,789.38/1,287,643.40
  6. Step 6: Final answer
    x = 583,835.70

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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.