Finding the Fourth Proportional to 1,289,394,208.95, 1,779,346,987.52 and 717,173,402.55
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Solution
The fourth proportional to 1,289,394,208.95, 1,779,346,987.52 and 717,173,402.55 is: 989,689,828.37
Step by Step Solution
- Step 1: Write the proportion equation
1,289,394,208.95 : 1,779,346,987.52 = 717,173,402.55 : x - Step 2: Convert to fraction form
1,289,394,208.95/1,779,346,987.52 = 717,173,402.55/x - Step 3: Cross multiply
1,289,394,208.95x = 1,779,346,987.52 × 717,173,402.55 - Step 4: Simplify right side
1,289,394,208.95x = 1,276,100,333,356,810,752 - Step 5: Solve for x
x = 1,276,100,333,356,810,752/1,289,394,208.95 - Step 6: Final answer
x = 989,689,828.37
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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.